Piston-ring-locking device.



W. NOHDGREN.

PISTON RING LOCKING DEVICE.

APPLICATION FILED ocT. 22. 19m.

l 2%,?@%9 Patented Sept. 18, 1917.

Figi.,

wimesses: Inventor:

g LQZJWM' Wrmer Norcdgrfen 'lUNlllD STATE@ PATENT @liilFllllE WERNER NORDGREN, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW' YORK.

PISTON-RINGr-LOCKING DEVICE.

Specification of Letters Patent.

Patenten sept. is, mit.

To all whom it may concern.'

Be it known that l, WERNER NORDGREN, a subject of the King of Sweden, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in Piston-Ring-Locking Devices, of which the following is a specification.

This invention relates to machines in which a piston coperates with a cylinder, and its object is to provide an etlicient means for preventing the rotation of the packing rings in the grooves in the piston. Piston rings are usually split to enable them to be sprung into the grooves, and if the rings work around until two or more of the joints get in longitudinal alinement the Huid under ypressure inthe cylinder can leak past the piston much more easily than when the joints in adjacent rings are kept angnlarly displaced.

Heretoiore, piston rings have been kept from rotating by means of radial pins or screws which were driven into the piston and engaged with corresponding holes in the inside of the rings. llt these pins or screws were of a comparatively large diameter, it was necessary to have correspondingly large holes in the piston rings, which, however, weakened the rings to such an extent that they soon brake. lt the pins were made rather small` *for the purpose of retaining the strength of the rings, they would break or wear down too fast. ln any event, these pins were liable to got loose and cause considerable trouble.

My invention aims to overcome these difficulties by securing the rings by one or more bolts inserted into holes drilled lengthwise of the piston and intersecting the bottoms ot' the grooves for the rings. At the joint in each ring, the inner corners oi the adjacent ends of the ring are cut away to engage the bolt. ln this way, it is possible to use strong bolts without weakening the rings. Provision is also made for enabling the rings to lock the bolts in their holes, so as ith all au tional tastenings,

'cese and wreck the madrawing, Figure l of piston equipped locking devices, and on on the line 22,

'i is of the The piston which is illustra hollow ortrunk variety, connected by a pin 2 with a pltman or connecting rod 3. It has the usual circumferential grooves for a plurality of packing rings 4, 5, 6, 7, 8; the

exact number being immaterial. Each ring is split at 9, and the joints of adjacent rings are displaced angularly. In the drawing, the displacement is 180 degrees, because only two locking bolts 10, ll are used. |lhese are inserted in holes l2 drilled longitudinally in the piston, preferably from its top or head and intersecting the bottoms of the ring grooves. At the joint of each ring the inner corners of the adjacent ends of the ring are cut away at 13 to fit against one of the bolts, while that portion of the ringopposite the joint engages with a notch 14 cut in the other bolt and neatly fitting the ring. The ring is thus locked from rotating by one of the bolts and, in turn, it locks the other bolt in its hole.

ln the drawing, the rings 4, 6 and 8 are locked from rotating by the left hand bolt, and the rings and 7 by the right hand bolt; while the rings 5 and 'i' lock the left hand bolt from slipping out, and the rings 4, 6 and 8 similarly lock the right hand bolt. A larger number ot bolts may be used if the joints of the rings are displaced by 120, 90, or other number of degrees.,

ln assembling, the bolts are first inserted into their holes and turned to bring their notches to register with the grooves. The rings are then sprung into place as usual, the joints of alternate rings engaging with each bolt, so that the rings and the bolts interlock as described above.

All the notches 14 do not need to tit the corresponding rings, as it is sufficient it only one ring locksA each bolt', the other notches being mere cut-away portions to permit the rings to pass the bolt.

in accordance with the provisions ot the patent statutes, l have described the prin ciplc of operation of my invention., together with the apparatus which now consider to represent the best einlnnlinieut thereof; but l desire to have it understood tha the ap pa atus shown is only 'illustrative and that the invention can be c. al out by other means.

lil/hat ll. claim as neitr by liettcrs Patent oi' the is:-

l. The combination of o.

piston liarii i g ciricc cumferential grooves and a plurality of longitudinally extending holes which intersect said grooves, split piston rings in said grooves having their ends arranged at the points Where theholes intersect the grooves, the ends of successive rings being arranged at different holes so they are staggered around the piston, locking bolts in said holes which engage between the ends of the rings to lock them in position, and means comprising locking connections between the piston rings and bolts to lock the bolts against movement.

2. The combination of a piston having circumferential grooves andV a plurality of longitudinally extending holes which intersect said grooves', split piston rings in said grooves having their ends arranged at the points where the holes intersect the grooves, i

the ends of successive ringsbeing arranged at different holes so they are staggered around the piston, and locking bolts in said holes which engage between the ends of the l rings to lock them in position, said bolts `locking bolts in said holes which engage in the spacesformed by the cut away corners te lock the rings in position, said bolts having notches at each groove where piston ring vends are not located which receive the bodies of the rings to lock the bolts against movement. i

4. The combination of a piston having circumferential packing ring grooves, and longitudinally extending holes which intersect the bottom of said grooves, split packing rings in said grooves, and bolts in said holes, said rings and bolts being interlocked with each other so as to lock both the rings and bolts in position.

5. The combination of a piston having circumferential grooves and a .plurality of longitudinally extending holes which intersect said grooves, split piston rings in said grooves having their ends staggered around the piston, and locking bolts in said holes, said locking bolts engaging recesses in some ofthe piston rings and having recesses which are engaged by other of the piston rings whereby the locking bolts serve to hold the rings against circumferential movement and the lrings serve to hold the locking bolts against longitudinal movement.

- In witness whereof, I have hereunto set my hand this 26th day of Sept. 1914.

WERNER NORDGREN. 

